/Engine/Source/Developer/CookedEditor/Public/CookedEditorTargetPlatform.h
Allows for a custom target platform module to initialize this TargetPlatform with an existing PackageManager instead of going through the standard factory function
TCookedEditorTargetPlatform ( [TUniquePtr](API\Runtime\Core\Templates\TUniquePtr)< [ICookedEditorPackageManager](API\Developer\CookedEditor\ICookedEditorPackageManager) > && ExistingManager )